Police officers, armed with model MarkV-A1, were shot at the end of a protest against police killings of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota, what was used to disable the shooter?  
C4
-1
Section::::Abstract.
MarkV-A1
13508231
-1
Section::::Abstract.
MarkV-A1
13508231
-1
Section::::Abstract.
2016 shooting of Dallas police officers
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